/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.io;

import proguard.classfile.ClassConstants;

import java.io.*;

/**
 * This <code>DataEntry</code> represents a file.
 *
 * @author Eric Lafortune
 */
public class FileDataEntry implements DataEntry {
    private final File directory;
    private final File file;
    private InputStream inputStream;

    public FileDataEntry(File directory, File file) {
        this.directory = directory;
        this.file = file;
    }

    /**
     * Returns the complete file, including its directory.
     */
    public File getFile() {
        return file.equals(directory) ? file : new File(directory, getRelativeFilePath());
    }

    // Implementations for DataEntry.

    public String getName() {
        // Chop the directory name from the file name and get the right separators.
        return file.equals(directory) ? file.getName() : getRelativeFilePath();
    }

    /**
     * Returns the file path of this data entry, relative to the base directory. If the file equals the base directory,
     * an empty string is returned.
     */
    private String getRelativeFilePath() {
        return file.equals(directory) ? ""
            : file.getPath().substring(directory.getPath().length() + File.separator.length())
                .replace(File.separatorChar, ClassConstants.PACKAGE_SEPARATOR);
    }

    public String getOriginalName() {
        return getName();
    }

    public long getSize() {
        return file.length();
    }

    public boolean isDirectory() {
        return file.isDirectory();
    }

    public InputStream getInputStream() throws IOException {
        if (inputStream == null) {
            inputStream = new BufferedInputStream(new FileInputStream(file));
        }

        return inputStream;
    }

    public void closeInputStream() throws IOException {
        inputStream.close();
        inputStream = null;
    }

    public DataEntry getParent() {
        return null;
    }

    // Implementations for Object.

    public String toString() {
        return getName();
    }
}
